Safety fuse



July 24, 1928.

T. L. VAUGHN, JR

SAFETY FUSE 2 vsnaetsfshaet 1 f Filed Jan. 4, 1926 m mi* gnou/tom Sno-Inc 11 a jnnlnnnr lllllll llllllllllllllllllllllllllllllllllllllllllllll lllllllt.

July 24,1928. y 1,678,131

- T. .1.. VAUGHN, JR

SAFETY Fus Filed Jan. 4, 192s 2 sheets-snm. 2

will!" *l ll m I Il U Patented July 24, 1928.

l, THOMAS L. VAUGHN, JR., OF CHARLOTTE, NORTH CAROLINA.

SAFETY FUSE.

Application led January The invention relates to a safety inse structure comprising supporting block with fuse engaging terminals carried there' by and a metal spring clip secured to the block adapted to clamp an insulated luso, as, i'or example, a fuse of the cartridge type, to the terminals, said clip being of such low current carrying capacity that it will be opened and closed.

i extensions o practically destroyed by the passage ot the line current through it, so Ythat any attempt to bridge the iuse terminals by wire or other metallic conductor, in impropersubstitution of the 'fuse,`will either burn out the clip or ground the current through a suitable connection with the clip. Preferably, the inse engaging terminals are arranged in pairs and are associated with a line switch, the stationary contacts o'f which are mounted on the block and the movable element of the switch is carried n the inside of the cover of an enclosing box in which the block is mounted. so that the line circuit will be open, when the cover is opened, and closed, when the cover is closed. y

The inventioii is illustrated in the accompanying drawings, in which 'y Fig. 1 is affront elevation of the apparatus with a portion `of the box or cover brolren away.v

Fig. 2 is a Fig. 3 is af section on line 3-3 of Fig. 2.

Fig'. 4 is a horizontal section through the fuse block.

Fig. 5 is a broken perspective showingl the mode of mounting and connecting one oi; the fuso engaging terminals.

Fig. 6 is a perspect vc view ol" the spring clip. t

`Referring to the drawings, 1 indicates the body ot a sheet metal box provided with earsl 2 extending upward from the sides and having pairs ot cable or conductor receiving nipples in its upper and lower ends., rlhc box is provided with a cover l having a closed jtront with side and end walls which telescope with the box, said cover being provided with lugl i i of its side walls, by means ot which the cover is pivoted to the box by rivets G .passing through registering openings in the lugs 2 and 5. `The bottom ot the cover is provided with a bail or handle 7 by means of which the cover is readily rhis construction of box provides a practically dust and moistureproot receptacle tor the fuse and switch section on line 2-7-2 olf Fig. 1;l

the corresponding walls otv 4, 1926. Serial No. 79,151.

mechanism, when the cover is closed, and the nipples 3 are substantially sealed by the cables or conductors passing into and out ot the boxf f l L Preferably secured tothe interior of the backwall ot the box are tour metallic lugs 10, with screw threaded Openings by means of which the fuse block is properly supported and secured within the box. The fuse block comprises two slab-like members 11 and 30, of generally rectangular form,r

fashioned ot slate or other insulating materia-l. Ihe slab 11 is adapted to be secured independently to the two lateral lugs 10 by;

means of screws 10 passing through open-` ing-sin the slab, the heads ot the screws being countersunlr. The outer' 'tace of theslab 11 is provided with two channels 12, 12 in whichare fixed two conductor strips 13` 13, by means oit screws passing from the baci: to the front of the slab. Mounted on the upper end ot each ot the conductor strips 13 is aA hollow stud 14 to which is secured a generally U-shapedl terminal 1550i a knife switch, each terminal `being locked to the stud by the bolt-'which secures the stud to the slab. j i

Fastened to the opposite end of each ot the strips 13 is atuse engaging contact coinprising a stud-like member 25, whichv is` secured to the strip by the screwl 25', which tastens the stud to the slab, the upper `tace ot Vcach studl being concaved to torni a seat for the conducting -end` of a 'fuse of the cartridge type. Formed in horizontal alignmentwith channels ,'12 are channels 12, each containing a conductor strip 26, to which is connected a stud 28 similar to stud 25 and constituting the other terminal for the `fuse, the strip 26 and the stud 28 being secured to the slab by screw 27. Likewise connected to each strip 26 is a binding post29 constituting the outlet terminal ior one of the main conductors.

The fuse block also comprises a second slab 30, which overlies the slab 11 and is tastenedto the latter by the screws 10,

10, which engage the Aupper and lower studs 10, 10. The outer slab 30' is provided with openings to permit thepassage oli the studs 14- and the knife switch terminals 15, supported thereby and also the two pairs of studs and 28, which constitute the terminals enga-ged by the fuses. The upper end ot the slab is recessed, as at 31, 31, to provide seats 'for conductor strips 32,

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